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Technical Cement Forum / Fineness Changing

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Nael 30/08/2008 20:57:43

Fineness Changing

I want to know about experiences of fineness change due to a long time of storage of bulk cement in silos. In our plant we have seen increases in Blaine from 3400 to 4000 cm2/g after about three months of storage of OPC in a silo. The cement didn't suffer any other change in its physical properties (setting, strength, flow behaviour). Since I have not found any explanation of this fact in the literature, I would like to hear some comments on this subject, in particular about the mechanism involved!

best regard

Raj Sahu 01/09/2008 06:10:16

Most probable reasons for increasing the Blaine while storing the cement for three months are as given under, 1.Mixing of higher fineness material from silo vent bag filter collected material. 2.Decrease in temperature of cement while storing for long time.As Blaine determination by air permeability apparatus increase in comparision to fresh ground cement as cold cement form more dense bed than fresh ground cement.

manish Kumar 26/12/2013 11:32:17

Did you checked the moisture of that cement. It may be the moisture content of the cement due to which you are getting more finess.

If moisture content is ok, then , agitate the sample properly and then remove any moisture/dry at 100 degree celcius, cool to room temperature in dessicator before determinination of finess.

gks 26/12/2013 16:33:06

Dear,

Pl tell me about your storage method of cement in silo.

Have you run venting system continusouly without feeding cement & cement extraction or stop after some time.

Regards

GKS

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